Seers, both ancient and modern, have said that man possesses within himself all the instruments of research which he can ever need, and that, in the progressive development of each of his present five senses, he is far from having exhausted die faculties with which Nature has endowed him. May there not then be a sixth, and even a seventh, sense, still waiting to be evolved? May not the present and growing interest in all things psychic, and the existence at this time of large numbers of people claiming the possession of psychic powers, be signs of the emergence of a new sense to be added to die present five? Science has long since passed from the study of matter to the study of force, and now, even in the last ten years, force itself is being split up and found to be granular in substance, to consist, in fact, of minute, but definitely measurable, “quanta” of energy. This is rapid travelling indeed, and we may well ask where the next ten years will lead us. One answer seems certain: “Beyond the range of any instrument of research at present known.” Will the new instrument be clairvoyance? Such is the question to which, in this book, the author wishes to suggest an answer. He seeks to take the reader with him into those fields of research in which he is now working, and to share with him some of the results of his investigations. At the end he offers an account of the nature of clairvoyance, of the mechanism of seership, and methods whereby it may be developed and employed.